Acceleration

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# Acceleration - PowerPoint PPT Presentation

Acceleration. Chapter 2 Section 2. Acceleration. Acceleration – The quantity that describes the rate of change of velocity in a given time interval. Average Acceleration – The average change in velocity divided by the change in time. Acceleration Equation. Acceleration Units.

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## PowerPoint Slideshow about ' Acceleration' - posy

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Presentation Transcript

### Acceleration

Chapter 2 Section 2

Acceleration
• Acceleration – The quantity that describes the rate of change of velocity in a given time interval.
• Average Acceleration – The average change in velocity divided by the change in time.
Acceleration Units
• The SI units for acceleration “m/s²”
• Acceleration = velocity/time = m/s/s = m/s²
Acceleration Vector
• Acceleration is a vector quantity
• Has both magnitude and direction
• Since acceleration is a vector, it can have a positive or negative value.
• If acceleration and velocity are in the same direction, the object speeds up.
• If the acceleration and velocity are in opposite directions, the object slows downs.
Graphing Linear Motion
• The slope and shape of a single graph can describe the motion of an object’s displacement, velocity, and acceleration vs. time.
• Slope = rise / run
• Rise – Dependant Variable (y-axis)
• Run – Independent Variable (x-axis)
Relating Displacement, Velocity and Acceleration
• On a Displacement vs. Time graph
• Rise / Run = Slope
• Displacement / Time = Velocity
• The tangent line of a single point on a (d vs. t) graph is equal to the instantaneous velocity at that moment in time.
• On a Velocity vs. Time graph
• Velocity / Time = Acceleration
• The tangent line of a single point on a (v vs. t) graph is equal to the instantaneous acceleration at that moment in time.
Graphing Hints

d vs. t

V vs. t

a vs. t

Area

Slope

Slope

Area

d vs. t

Slope = Velocity

V vs. t

Slope = Acceleration

a vs. t

Area = Velocity

V vs. t

Area = Displacement

=>

=>

=>

Graph of a Single Object In Motion

displacement

vs.

time

velocity

vs.

time

acceleration

vs.

time

d

v

a

t

t

t

Object In Free Fall

displacement

vs.

time

velocity

vs.

time

acceleration

vs.

time

d

v

a

t

t

t